The Hillman Group 370351 Plastic Anchor Kit Number 10-12 Includes Screws and Drill Bit , 1-Pack Kit Contents per Pack: 10-12 x 1" (100 pcs.), Pan Head Slotted Sheet Metal Screws (100 pcs.), 1/4" Drill Bit 1/4" drill size Works well in hard surfaces and hollow surfaces where no studs or beams are behind the surface